This week's 'Comedy Central Roast of Donald Trump' reminded us of that whole bizarre, widely publicized beef between The Donald and Rosie O'Donnell, and it got us reminiscing about all the other high-profile celebrity feuds that have captivated our attention, sometimes for years on end. Here are five of our favorites -- from Tom Cruise vs. Brooke Shields to Charlie Sheen vs. The Trolls....